The DAYCO DT1163H thermostat is engineered to maintain your engine's ideal operating temperature. By precisely controlling the flow of coolant through the radiator, it prevents overheating and ensures efficient performance. This thermostat plays a vital role in your vehicle's cooling system. When the engine is cold, it remains closed, allowing the coolant to circulate within the engine block to reach optimal operating temperature faster. Once the coolant reaches the designated temperature, the thermostat opens, allowing coolant to flow to the radiator for cooling. Proper functioning of the thermostat is essential for fuel efficiency and reducing emissions. A faulty thermostat can lead to engine damage, poor fuel economy, and increased wear on engine components. DAYCO thermostats are built to meet or exceed OE specifications for reliability and performance.